Biological Oxygen demand (BOD) is used as a standard measure of

Options :
  1. Oxygen level in forest System
  2. Oxygen level in animals
  3. Oxygen level in water system
  4. Oxygen level in atmosphere
Answer and Explanation :-

Answer: Option 3

Explanation:

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So it is always preferable to discuss the matter of veganism in a non-judgemental way. Remember that to most people, eating flesh or dairy and using animal products such as leather, wool, and silk, is as normal as breathing air or drinking water. A person who consumes dairy or uses animal products is not necessarily or usually what a recent and unpopular American president labelled an "evil doer.
-Gary L. Francione